Question

In toroid magnetic field on axis will be radius = 0.5 cm, current = 1.5A, turns = 250, permeability = 700.

• A. 7.5 Tesla
• B. 10.5 Tesla
• C. 4.5 Tesla
• D. 15.5 Tesla

Answer 1

Answer: (B)

$B=\mu o\mu r\left[\frac{N}{2\pi r}\right]I$
$B=700\times 4\pi \times 10^{-7}\left[\frac{250\times 100}{2\times \pi \times 0.5}\right]\times 1.5$
$=\frac{1400\times 10^{-7}\times 10^3\times 1.5}{0.5}$
$=75\times 1400\times 10^{-4}$ Tesla
$=75\times 14\times 10^{-2}$ Tesla
$=1050\times 10^{-2}$ Tesla
= 10.5 Tesla